How i can write search function in CI ?

[eluser]aamiraziz[/eluser]
Respected Developers,

i' m working on Job Portal. i don't know how can i write search function to find jobs in database.

i need to retrieve records using keyword matching (job title), not the exact title of job.
how can i write the function ??

is there any sample search function ?? please provide it to me

thank you for support.